Agilent does not provide a coaxial calibration kit for either your 75 Ohm BNC or your 'coax insert' device under test coaxial interfaces.

For your 75 Ohm BNC device side you could visit Maury Microwave and inquire as to their 75 Ohm BNC kits (http://www.maurymw.com). I believe the Maury 75 Ohm BNC kits are part numbers 8580A, 8580A01 or 8580A02 - confirm with Maury.

As for your 'coax insert' device side I do not readily know of any vendor with defined calibration kits for this family of connectors. You could inquire with Maury on this item as well - but I believe the prospects are doubtful. You could also try Huber-Suhner (http://www.hubersuhner.com/ie60/hs-index). Another idea would be to discuss the connector with the manufacturer of the 'coax insert' and see if they can advise you how they characterize these interfaces. And finally if you have to come up with a 'home-brewed' solution the following may be of significant help - 'Agilent Specifying Calibration Standards for the Agilent 8510 Network Analyzer Application Note 8510-5B' available at http://cp.literature.agilent.com/litweb ... 6-4352.pdf.